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- anthropic-prompt-caching.md: KV cache mechanics, TTLs, pricing, auto vs explicit - openai-prompt-caching.md: automatic caching, in-memory vs 24h retention, prompt_cache_key - anthropic-prompting-best-practices.md: clear instructions, XML tags, few-shot, model-specific notes - openai-prompting-best-practices.md: message roles, optimization framework, structured outputs, model selection Key findings: - Anthropic caching: only for Claude models, 5m default TTL, 1h optional, 10% cost for reads - OpenAI caching: automatic/free, 5-10min default, 24h extended for GPT-5+ - GLM/ZAI models: neither caching mechanism applies - Subagent model routing table added to openai-prompting-best-practices.md